Short-circuiting mechanism



April 3, 1928'. l 1,664,561

J. J. JANcA sHoRT CYIRCUITING MECHANISM Filed Dec. 2'4, 1925 named Apr. 3, 192s.

UNITED STATES PATENT OFFICE.

JOSEPH J. JANCA, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE EMERSON ELECTRIC MFG. CO., 0F ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

SHORT-CIRCUITING MECHANISM.

Application filed December 24, 1925.

This invention relates to short cireuiting mechanism and consists in the novel construction hereinafter disclosed.

An object of the invention is to provide a short circuiting unit adapted to be operated by centrifugal force, which unit is arranged for convenient assembly with the armature shaft so that it may be readily installed and removed.

-Another object of the invention is to pro-r vide a positively acting short circuiting mechanism that will operate accurately at predetermined speeds and which may be easily adjusted to operate at different predetermined speeds.

Additional advantages of the construction will be readily apparent from the following detailed description thereof, taken in connec-tion with the accompanying drawing in which Fig. 1 is an elevation of an armature show- .i ng the improved short circuiting mechanism installed therewith;

Fig. 2 is an end elevation;

Fig. 3 is a View partially in vertical section;

Fig. 4 is a face view of the contact disk;

Fig. 5 is a view of the actuator for the disk; y

Fig. 6 is a. view of a retainingv plate; and,

7 is a view of the actuating arms with their supporting rings.

In the embodiment of the invention illustrated in the drawing, I have shown the invention as associated with an armature 1 of usual construction, having an armature shaft 2. On the armature shaft is a ring 3 arranged vto support the commutator segments` 4.

The short circuiting of the armature is accomplished by actuating a. contact diskv inwardly against `the vertical. faces of the commutator segments. The contact disk comprises a ring 5 having a plurality of spaced fingers 6 whichare curved .inwardly towards the vertical faces of the commutator segments when the disk is assembled.

The armature shaft carries an elongated collar 7 that extends at one end within the mounting 3 for the commutator segments and outwardly at the other end beyond the'y vertical plane of the commutator segments. This collar has at its inner end a 'iangey 8. The support for the actuator arms is in the Serial No. 77,646.

form of a ring 9 having equally spaced pairs of ears 1() formed integral therewith, said ears having overturned ends vforming eyes for a pivot pin. Pivotally connected with each pair of ears 10 is an arm 11 having an eye 12 formed at its inner end. The inner end of each armv extends between its respective pair of ears 10 and a pivot pin 13 serves to connect the arms with the support, so that the outer ends of the arms may move radially in respect of the axis of the armature shaft.

The support vior the arms 11 is fast on the collar 7 and an expansion spring 14 is interposedbetween the ring 9 and a retaining ring 15 mounted loosely on the collar 7, which ring 15 abuts against the ring portion 5 of the contact disk. The retaining ring is provided with a series of notches 16 Ythrough which the arms 11 extend, and also with. a series of forwardly extending arms 17 that project through the opening in the ring 5 and upon which said ringis supported. The forward ends of the arms 17 are arranged to extend across the edge of the actuator for the contact disk between the arms thereof, thus serving to prevent this member from yrotating with the contact disk which is free torevolve on the arms 17.

'The actuator for the contact disk comprises a spider having' a. center portion 18 adapted to tit over the collar .7 and arms 19 ,to revolve independentlyroi the actuator.

In assembling the device. the supporting vring 9 of the actuating arms with the arms '11 mounted, thereon is fitted over a reduced end ot the collar 7, which reduced end is then coined over against the ringr 9, thereby vrigidly securing the ringr 9 to the collar 7.

The spring 14 is then mounted over the collar 7 andthe retaining member 15 interposed against the outer end of the spring, the arms 11 seating in the notches 16 of the ring. The cont-act diskv 5 is then titted over lil the ears 1"( and the actuator 18 is assembled. After lthe assembly of these parts, the rollers are mounted by connecting the loops 23 over the reduced portion 24 of said rollers. The normal action of the spring 14 is to hold the rollers ini'vardly of the shoulders 2O of the. arms 19. `When the armature shaft has attained the predeterminedv speed, the `free ends of the arms 11 will move radially outwardly and the rollers will snap over the shouldersZO, .moving the actuator iliwardly against the contact disk 5, thereby forcing the fingers G into Contact with the vertical faces of the commutator segn'icnts and thus short circuiting the armature.

The adjustment of the short cireuitlng mechanism so that it will operate at predetermined speeds may be accomplished by varying the weight of the rollers 25, or by varying the tension of the spring 14. The rollers 25 may be made of different weights and the spring la of different tension, and, as both the. rollers and spring may be readily changed, the adjustn'ient for dierent speeds may be easily accomplished.

It is apparent from the foregoing that the device is simple in construction, positive in operation, and that it may be readily assembled and disassembled for the purpose of repair, replacement or adjustment.

I am aware that the invention may be modified in certa-in particulars without ldeparting from the spirit and scope thereof and I do not limit myself, therefore, to the exact construction or to the preferred embodiment of the invention, but what I claim and desire to secure by Letters Patent is 1. A short eircuiting mechanism comprising a contact member movable to make and break contact with commutator segments, an actuator for moving the Contact member to contact with the commutator segments, a plurality of arms each pivoted at one end and having its other end free, and a roller connected to and movable with the free end of each of said arms and arranged to operate by centrifugal force to engage and move said actuator and thereby said contact member into contact with the commutator segments.

AV short circuitingw mechanism comprising the conibiiiatiou of an armature shaft and a connnntanw havingcommutator segments with faces disposed transversely of the axis of the shaft. a support mounted on the shaft,

arms pivoted to said support, a contact disk arranged transversely of the shaft, an `actuator for movingv said disk toward the contact faces of the commutator segment-s, means normally actuatiner said actuator outwardly from the Contact faces of the commutator segment-s, and rollers releasably supported by the free ends of said arms adapted to move radially of the axis of the sha-ft when the shaft is rotated and to engage and move Leanser said actuator longitudinally of the armature shaft thereby moving said disk into contact with the con'nnutator segments.

3. A short circuiting mechanism comprising the combination of an armature sha-ft, a com-niutator having faces transversely disposed in respect of the shaft, a. contact member arranged to be moved into contact with the contact faces of the commutat-or segments,r an actuator for said contact member, said actuator having),` a cam face, a, plurality of arms, a support for said arms for pivot all),v connecting one end thereof with the armature shaft, rollers connected to and movable with the free end of said arm adapted to cooperate with the cam face of said actuator, and means holding the rollers in contact with said cam face of the actuator.

l. A short circuiting mechanism comprising the combination of an armature sha-ft, a commutator having contact faces disposed transversely of the shaft, a` support carried by the shaft, arms pivoted to the support and having their free ends extending;r outwardly from the contact faces of the commu- Y tator, a contact disk intermediate of the free ends of the 'arms and the faces of said commutator, an actuator between the free ends of said arms and said contact disk, a spring normally moving the actuator outwardly from the commutator, and rollers releasably supported by the free ends of said arms arrange-d to contact with said actuator' and to move the saine inwardly against the contact disk when the shaft is rotated at a predetermined speed, said rollers also serving to hold the parts in assembled relationship.

5. A short circuiting mechanism comprising the combination of an 'armaturesha-ft, a commntator having contact faces disposed transversely of the shaft, a support carried by the shaft, arms pivotedv to the support and having their free ends extending outwardly from the contact faces of the commutator, a contact disk intermediate of the free ends of the arms and the faces of said commutator, an actuator having cam faces disposed between the outer extremity of the arms and the contact disk, a spring normally retracting tbe contact Idisk from the commuf tator, and rollers carried by the free ends of said arms arranged to make contact with the actuator, said rollers being adapted to ride over said cam faces when a predetermined speed has been attained by the armature shaft, thereby causingr said actuator to actuate the contact disk into contact with the contact faces of the commutator.

6. A short circuiting mechanism com prising lthe combination of an armature shaft. a commutator having faces in a plane crossing the axis of said. sha-ft, a support fast on the shaft, a. retaining device, a spring interposed between said retaining device and said support normally actuating said device outwardly from the contact faces of the eommutator, arms pivoted to said support at one end and being free to move radially of the armature shaft at the opposite end, a contact member' carried by said retaining device arranged to revolve independently of the armature shaft, a device for actuating the Contact member into contact with the Contact faces of t-he commutator, and rollers carried by the free ends of said arms operatively connected with the actuator for moving the same, whereby the contact member will be caused to make and maintain contact with the commutator when the armature shaft has atta-ined a predetermined speed.

7. A short circuiting mechanism comprising the combination of an armature shaft, a commutator having contact faces, a. supporting element loosely supported by the shaft, a. member supported by said supporting element for movement to and from contact with said faces, an actuator for moving said member into contact with said faces, a

t series of arms extending through said member and said actuator and having their inner ends pivoted for outward swinging movement, and an element on the outer end of each of said arms operated by centrifugal force resulting from the rotation of said shaft to move said actuator in a direction to move said member into contact with said faces.

8. A short circuiting mechanism comprising the combination of an armature shaft, a commutator having contact faces, a supporting element loosely supported by the shaft, a member supported by Isaid supporting element for movement to and from contact with said faces, an actuator for moving said member into contact with said faces, a series of arms extending through said member and said actuator and having their inner ends pivoted for swinging movement away from the axes of the shaft, an element on the outer end of each of said arms operated by centrifugal force resulting from the rotation of said shaft to move sald actuator in a direction to move said member into contact with said faces, and a spring acting to move said member out of contact with said faces when the armature shaft stops.

9. A short circuiting mechanism comprising the combination of an armature shaft, a conunutator having contact faces, a Contact member movable longitudinally of the shaft and adapted to make and break contact with said contact faces of the commutator segments, and a device for actuating said contact member including an arm normally extending longitudinally of the shaft, said arm being pivoted at one end, a roller carried by the free end of said arm and movable outwardly with said arm when the armature shaft is rotated at a predetermined speed, and connections between said contact member and said roller for moving said contact member into contact with said contact faces when said armature shaft is rotated at a predetermined speed.

l0. A short circuiting mechanism comprising the combination of an armature shaft, connnntator segments having faces transversely disposed in respect of the shaft, a contact member arranged to be moved into contact with the Contact faces of the commutator segments, a plurality of arms extending longitudinally of the armature shaft and pivoted at one end for swinging movements in radial planes, a weighted member carried by the outer extremity of each of said arms and movable in radial planes therewith by the rotation of the armature shaft. and an element operated by said weighted members to move said Contact member into contact with said Contact Segments of the commutator faces when said armature shaft is rotated at a predetermined speed. n

JOSEPH J. JANCA. 

